JP2007002757A - Intake air amount control device for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intake air amount control device for an internal combustion engine, capable of appropriately responding to adhesion of deposits to an intake valve. <P>SOLUTION: This device is applied to the internal combustion engine having a lift amount change mechanism changing the maximum lift amount VL of the intake valve. Based on the maximum lift amount VL, intake air amount GAb in a reference condition is calculated (S102), and actual intake air amount GA is detected (S104). A deviation rate ΔGA of the intake air amount GAb and the actual intake air amount GA is calculated (S106). When the deviation rate ΔGA is below a predetermined value β (YES in S108 and NO in S110), target lift amount Tvl is corrected in accordance with the deviation rate ΔGA (S112 and S114). When the deviation rate ΔGA exceeds a predetermined value β (YES in S110), this situation is informed (Step S116). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an intake air amount control device for an internal combustion engine provided with a lift amount changing mechanism for changing a maximum lift amount of an intake valve.

  As a mechanism for adjusting the intake air amount of the internal combustion engine, a mechanism having a lift amount changing mechanism for changing the maximum lift amount of the intake valve according to the engine operating state has been proposed. Such an internal combustion engine can reduce the pumping loss when the required intake air amount is small, for example, during idling operation, as compared with the internal combustion engine in which the intake air amount is adjusted by reducing the throttle valve. Therefore, it has been attracting attention in recent years.

  By the way, in such an internal combustion engine, when deposits adhere to the intake valve, the substantial opening area of the intake valve decreases due to this, and the intake amount also decreases accordingly. The adjustment accuracy will decrease.

  Therefore, conventionally, in order to compensate for the decrease in the intake air amount due to such deposit adhesion, it has been proposed to correct the operation amount of the lift amount changing mechanism (see, for example, Patent Document 1). Specifically, based on the maximum lift amount of the intake valve and the engine rotation speed, the intake amount in the reference state where no deposit is attached is obtained, and the above operation amount is determined in accordance with the deviation between this and the actual intake amount. I am trying to correct it.

As prior art documents according to the present invention, there are the following Patent Documents 2 and 3 in addition to the above Patent Document 1.
JP 2004-251241 A JP 2003-148177 A JP 2004-197630 A

  Here, the lift amount changing mechanism has an operable range determined by its structure. Therefore, even if the operation amount of the lift amount changing mechanism is corrected as described above, under the situation where the correction amount is large, the operation amount may exceed the operable range and the correction may be executed. It may not be possible. Therefore, if only the correction of the operation amount of the lift amount changing mechanism is performed for the deposit adhering to the intake valve, it may not be possible to cope with the deposit.

  The present invention has been made in view of such circumstances, and an object thereof is to provide an intake air amount control device for an internal combustion engine that can appropriately cope with deposit adhesion to an intake valve.

Hereinafter, means for achieving the above-described object and its operation and effects will be described.
First, the invention according to claim 1 is applied to an internal combustion engine provided with a lift amount changing mechanism for changing the maximum lift amount of an intake valve, and an intake amount index value and an actual intake amount index estimated based on the maximum lift amount are provided. In the intake air amount control apparatus for an internal combustion engine that controls the actual intake air amount by executing the operation control of the lift amount changing mechanism according to the engine operating state while performing correction according to the deviation degree from the value, the deviation degree is predetermined. The gist of the invention is to provide a notifying means for notifying that when the value is greater than or equal to the value.

  According to the above configuration, when deposit adheres to the intake valve, when the deposit amount is small, this is dealt with by correcting the operation amount of the lift amount changing mechanism, and when the deposit amount increases, the fact is notified. It is possible to deal with such as prompting the deposit removal. Accordingly, it is possible to appropriately cope with deposit adhesion to the intake valve.

The intake air amount index value includes, in addition to the intake air amount itself, a value that changes in correlation with the intake air amount, such as intake air pressure.
According to a second aspect of the present invention, in the intake air amount control apparatus for an internal combustion engine according to the first aspect, an opening degree of a throttle valve provided in the intake passage of the internal combustion engine is used as an estimation parameter for the intake air amount index value. The gist is to use it.

According to the above configuration, the intake air index value can be accurately estimated in accordance with the opening of the throttle valve that changes the intake air.
According to a third aspect of the present invention, in the internal combustion engine intake air amount control apparatus according to the first or second aspect, the internal combustion engine includes a plurality of cylinders, and the lift amount changing mechanism corresponds to the cylinders. The gist is that the maximum lift amount of the intake valve is changed in the same manner.

  When a plurality of intake valves are provided, the deposit adhesion amount differs for each intake valve. For this reason, when deposit adheres to each intake valve in an internal combustion engine having a plurality of cylinders, the amount of decrease in the intake air amount due to the attachment varies from cylinder to cylinder. Fluctuation increases. In such a case, in an internal combustion engine provided with a lift amount change mechanism that changes the maximum lift amount of the intake valve corresponding to each cylinder in the same manner, even if the operation amount of the lift amount change mechanism is corrected, The above-described variation in intake air amount cannot be eliminated. Therefore, in the case of the internal combustion engine, it is difficult to cope with the case where deposits are deposited. According to the said structure, when a deposit adheres to the intake valve of such an internal combustion engine, it can respond now appropriately.

  According to a fourth aspect of the present invention, in the intake air amount control device for an internal combustion engine according to any one of the first to third aspects, the degree of deviation is obtained on condition that the internal combustion engine is in an idle operation state. The gist of the invention is to execute the operation control of the lift amount changing mechanism and the notification by the notification means in accordance with the obtained degree of deviation.

  Here, the idling operation state of the internal combustion engine is a stable engine operation state in which it is possible to accurately estimate the intake air amount index value and detect the actual intake air amount index value. In addition, during the idling operation of the internal combustion engine, since the required intake amount is small and the maximum lift amount of the intake valve is small, the reduction ratio of the opening area of the intake valve when deposits are attached is low, and as a result, The degree of deviation between the estimated intake air amount index value and the actual intake air amount index value increases. Therefore, it can be said that the idling operation state of the internal combustion engine is an engine operation state suitable for obtaining the degree of deviation.

  In this regard, according to the above configuration, since the operation control of the lift amount changing mechanism and the notification by the notification means are executed according to the degree of divergence obtained in such an idle operation state, it is possible to deal with deposits more appropriately. Will be able to.

  According to a fifth aspect of the present invention, in the intake air amount control device for an internal combustion engine according to any one of the first to fourth aspects, the divergence degree is the same when the divergence degree is equal to or greater than a first predetermined value. The gist of this is to make a corresponding correction and to notify the informing means to that effect when the degree of divergence is greater than or equal to a second predetermined value greater than the first predetermined value.

  In the above configuration, when deposits are attached to the intake valve, both “correcting the operation amount of the lift amount changing mechanism” and “notifying that when the deposit amount increases” are described. A new treatment method is added to one of the treatment methods, such as “do not correct the operation amount of the lift amount changing mechanism when the deposit adhesion amount is very small”. Therefore, for example, when the deposit amount is small and the amount of decrease in the intake air amount corresponding to the deposit amount is small, the operation amount of the lift amount changing mechanism is executed without performing the correction according to the degree of deviation. Thus, it is possible to select a treatment method that does not perform this correction when the correction is not necessary. Therefore, according to the above configuration, it is possible to cope with deposit adhesion with a higher degree of freedom.

  In addition, when performing the notification by the notification means, in addition to executing the correction according to the divergence degree, the correction according to the divergence degree can be stopped as in the invention according to claim 6.

  According to such a configuration, when the deposit amount increases, it is possible to select a control mode other than the control mode of executing correction according to the degree of divergence and execute operation control of the lift amount changing mechanism. become able to.

Hereinafter, an embodiment in which an intake air amount control apparatus for an internal combustion engine according to the present invention is embodied will be described.
FIG. 1 shows a schematic configuration of an intake air amount control apparatus according to the present embodiment.

  Note that the intake air amount control device according to the present embodiment is applied to an internal combustion engine that has a plurality of (specifically, four) cylinders and is mounted on a vehicle. FIG. Only shows.

  As shown in FIG. 1, a throttle valve 14 is provided in the intake passage 12 of the internal combustion engine 10. A throttle motor 16 is connected to the throttle valve 14. Then, the opening degree of the throttle valve 14 (throttle opening degree TA) is adjusted through the drive control of the throttle motor 16.

  In the internal combustion engine 10, the intake passage 12 and the combustion chamber 18 are communicated and blocked by the opening / closing operation of the intake valve 30. The intake valve 30 opens and closes with the rotation of the intake camshaft 34 to which the rotation of the crankshaft 26 is transmitted.

  A lift amount changing mechanism 42 is provided between the intake camshaft 34 and the intake valve 30. The lift amount changing mechanism 42 is driven by a single actuator 44 such as an electric motor, for example, and changes the maximum lift amount VL of the intake valves 30 of all cylinders in the same manner. A change mode of the maximum lift amount VL of the intake valve 30 based on the operation of the lift amount changing mechanism 42 is shown in FIG. As can be seen from FIG. 2, the maximum lift amount VL of the intake valve 30 changes in synchronization with the valve opening period (lift operation angle). For example, the lift operation angle increases as the maximum lift amount VL increases. It will become. An increase in the lift operating angle means that the valve opening timing and the valve closing timing of the intake valve 30 move away from each other, which means that the valve opening period of the intake valve 30 becomes longer.

In the present embodiment, the amount of air (actual intake air amount GA) taken into the combustion chamber 18 of each cylinder through the intake passage 12 is adjusted as follows.
That is, first, a required value (required intake air amount Tga) for the actual intake air amount GA is calculated on the basis of the depressed amount of the accelerator pedal (accelerator depressed amount ACC). Next, a control target value (target lift amount Tvl) for the maximum lift amount VL of the intake valve 30 is calculated based on the required intake amount Tga. Then, the operation control (lift control) of the lift amount changing mechanism 42 is executed so that the target lift amount Tvl and the actual maximum lift amount VL coincide with each other. At the same time, a control target opening degree (target throttle opening degree Tta) for the throttle opening degree TA is calculated based on the maximum lift amount VL of the intake valve 30 and the required intake air amount Tga. Then, the opening degree control (throttle control) of the throttle valve 14 is executed so that the target throttle opening degree Tta and the actual throttle opening degree TA coincide with each other. Thus, in the present embodiment, the actual intake air amount GA is adjusted so as to converge to the required intake air amount Tga corresponding to the engine operating state through the cooperative control of the lift control and the throttle control.

  Here, the actual intake amount GA increases as the throttle opening degree TA increases and as the maximum lift amount VL of the intake valve 30 increases. Therefore, in the above-described cooperative control, when the maximum lift amount VL of the intake valve 30 is set large, the throttle opening degree TA is set relatively small, and conversely, when the maximum lift amount VL is set small, the throttle opening degree TA is set relatively. Thus, throttle control and lift control are executed so that the actual intake air amount GA is adjusted to a desired amount.

  A fuel injection valve 20 is provided in the intake passage 12 of the internal combustion engine 10 corresponding to each cylinder. Then, the drive of each fuel injection valve 20 is controlled according to the actual intake air amount GA adjusted as described above, and the fuel injection amount is adjusted so that the air-fuel ratio of the air-fuel mixture becomes a desired ratio. In each combustion chamber 18 of the internal combustion engine 10, ignition is performed on an air-fuel mixture composed of intake air and injected fuel, whereby the air-fuel mixture is combusted, the piston 24 reciprocates, and the crankshaft 26 rotates. The air-fuel mixture after combustion is sent out from the combustion chamber 18 to the exhaust passage 28 as exhaust.

  The vehicle is provided with various sensors for detecting the running state and the operating state of the internal combustion engine 10. The various sensors include, for example, a throttle sensor 52 for detecting the throttle opening degree TA, an intake air amount sensor 54 for detecting the actual intake air amount GA, and an intake air pressure for detecting the intake air pressure (intake air pressure PM). A sensor 56 is provided. The intake air amount sensor 54 is provided on the upstream side of the throttle valve 14 in the intake passage 12, and the intake pressure sensor 56 is provided on the downstream side of the throttle valve 14. In addition, a water temperature sensor 58 for detecting the temperature THW of the engine cooling water, a lift sensor 60 for detecting the maximum lift amount VL of the intake valve 30 (specifically, the operation amount of the lift amount changing mechanism 42), and depression of the accelerator An accelerator sensor 62 for detecting the amount ACC, a vehicle speed sensor 64 for detecting the traveling speed of the vehicle (vehicle speed SPD), and the like are also provided. A warning lamp 66 is provided as a notification means in the passenger compartment.

  The internal combustion engine 10 includes an electronic control device 50 configured to include, for example, a microcomputer. The electronic control device 50 takes in the output signals of various sensors and performs various calculations, and executes various controls related to engine control such as throttle control, lift control, and fuel injection control based on the calculation results.

  Here, when deposit is attached to the intake valve 30, the substantial opening area of the intake valve 30 decreases, and the actual intake amount GA becomes insufficient by that amount. Therefore, in the present embodiment, a process (correction process) for correcting the target lift amount Tvl is executed as a process for dealing with the shortage of the actual intake air amount GA.

  Hereinafter, such correction processing will be described with reference to the flowchart shown in FIG. Note that a series of processing shown in this flowchart shows a specific processing procedure of the correction processing, and is executed by the electronic control unit 50 as processing at predetermined intervals.

As shown in FIG. 3, in this process, it is first determined whether or not a calculation condition is satisfied (step S100). Specifically, it is determined that the above calculation condition is satisfied when both of the following conditions are satisfied.
-The internal combustion engine 10 is in an idle operation state. Specifically, the state where the accelerator depression amount ACC is “0” and the vehicle speed SPD is “0 km per hour” is continued for a predetermined time.
-The internal combustion engine 10 has been warmed up. Specifically, the engine cooling water temperature THW is equal to or higher than a predetermined temperature.

  When the above calculation condition is satisfied (step S100: YES), a reference state in which no deposit is attached to the intake valve 30 by map calculation based on the throttle opening degree TA, the maximum lift amount VL, and the intake pressure PM. Is calculated (step S102). In the map used for this map calculation, the relationship between the engine operating state determined by the throttle opening degree TA, the maximum lift amount VL, and the intake pressure PM and the intake amount GAb in the reference state is obtained through experimental results and set. Has been. As the intake air amount GAb, a larger amount is calculated as the throttle opening degree TA is larger, the maximum lift amount VL is larger, and the intake pressure PM is higher. In conjunction with this, the actual intake air amount GA is detected (step S104). Then, a deviation rate ΔGA (= (GAb−GA) / GAb) between the intake air amount GAb and the actual intake air amount GA is calculated (step S106).

  Here, the idling operation state of the internal combustion engine 10 is a stable engine operation state in which it is possible to accurately estimate the intake air amount GAb and detect the actual intake air amount GA based on the engine operation state. Moreover, since the required intake air amount Tga is small and the maximum lift amount VL of the intake valve 30 is small, the reduction ratio of the opening area of the intake valve 30 when deposits are high is high, and the influence of the attachment is influenced by the intake air amount GAb and the actual intake air amount. It can be said that the engine operating state is likely to appear at a deviation rate ΔGA from GA. Thus, the idling operation state of the internal combustion engine 10 is an engine operation state suitable for obtaining the deviation rate ΔGA. Based on this point, in the present embodiment, the deviation rate ΔGA is calculated on the condition that the internal combustion engine 10 is in an idle operation state.

Then, one treatment mode is selected from the three different treatment modes according to the calculated deviation rate ΔGA.
First, when the deposit amount on the intake valve 30 is “0” or very small, and the deviation rate ΔGA is lower than the predetermined value α (step S108: NO), it is not necessary to deal with deposit adhesion. As a result, the present process is temporarily terminated without performing the following process. In this case, a treatment method such as “do not correct the target lift amount Tvl” is selected.

  Thereafter, when the deposit adheres to the intake valve 30 and the deviation rate ΔGA becomes equal to or greater than the predetermined value α (step S108: YES and step S110: NO), in order to compensate for the decrease in the actual intake amount GA due to the deposit, A treatment method such as “correct the target lift amount Tvl” is selected.

  Specifically, the correction amount K is calculated based on the deviation rate ΔGA (step S112), and the correction amount K is added to the target lift amount Tvl to calculate a new target lift amount Tvl (step S114). ). The electronic control unit 50 obtains and stores the relationship between the correction amount K that can properly compensate for the decrease in the actual intake air amount GA due to deposit adhesion and the deviation rate ΔGA through experimental results and the like. As the correction amount K, a larger amount is calculated as the deviation rate ΔGA is higher. Therefore, in this case, the target lift amount Tvl is corrected so that the maximum lift amount VL of the intake valve 30 increases as the deviation rate ΔGA increases.

  Thereafter, when the deposit adheres to the intake valve 30 further and the deviation rate ΔGA becomes equal to or larger than the predetermined value β that is larger than the predetermined value α (step S110: YES), the warning lamp 66 is turned on and abnormal. Is notified (step S116). That is, in this case, a treatment method such as “notifying that the deposit amount has increased” is selected. As a result, the vehicle is brought into the maintenance shop, and as a result, the removal of the deposit from the intake valve 30 is urged.

  In this case, the correction according to the deviation rate ΔGA is stopped, and a value (predetermined value γ) corresponding to the upper limit of the controllable range of the maximum lift amount VL is set as the target lift amount Tvl (step S118). ). As a result, the maximum lift amount VL of the intake valve 30 is fixed at the upper limit. In this case, the actual intake air amount GA is adjusted so as to converge to the required intake air amount Tga through adjustment of the throttle opening degree TA by throttle control.

Hereinafter, the reason for correcting the target lift amount Tvl in this way will be described.
When a plurality of intake valves are provided, the deposit adhesion amount differs for each intake valve. For this reason, when deposit adheres to each intake valve in an internal combustion engine having a plurality of cylinders, the amount of decrease in the intake air amount due to the attachment varies from cylinder to cylinder. Fluctuation increases. In such a case, in the internal combustion engine 10 provided with the lift amount changing mechanism 42 for changing the maximum lift amount VL of the intake valve 30 corresponding to each cylinder in the same manner, the operation amount of the lift amount changing mechanism 42 is provided. (To be precise, even if the target lift amount Tvl) is corrected, the above-described variation in intake air amount cannot be eliminated. Therefore, when the deposit amount in the internal combustion engine 10 is large, it is extremely difficult to cope with the deposit.

  However, when the gap through which the intake air passes (specifically, the interval between the intake valve 30 and its valve seat) is reduced due to the deposit, the ratio of the decrease amount to the entire interval (decrease rate) is the maximum of the intake valve 30. The lower the lift amount VL, the lower. For this reason, even if the deposit adheres, the reduction rate of the actual intake air amount GA can be kept low by setting the maximum lift amount VL of the intake valve 30 to a large value, and the instability of the engine operation state is suppressed. Will come to be.

  In the present embodiment, in view of these points, when the deviation rate ΔGA is equal to or greater than the predetermined value β, the maximum lift amount VL of the intake valve 30 is fixed at the upper limit to suppress instability of the engine operation state. The actual intake air amount GA is adjusted by adjusting the throttle opening TA.

As described above, according to the present embodiment, the effects described below can be obtained.
(1) When the deposit amount on the intake valve 30 is small, the target lift amount Tvl is corrected, and when the deposit amount increases, it is notified so that the deposit removal is promoted. You will be able to deal with it appropriately.

  (2) The deviation rate ΔGA is obtained on the condition that the internal combustion engine 10 is in an idling state suitable for obtaining the deviation rate ΔGA, and the target lift amount Tvl is corrected or warned according to the obtained deviation rate ΔGA. Since the lamp 66 is turned on, it becomes possible to cope with deposit adhesion more appropriately.

  (3) When the deviation rate ΔGA is equal to or greater than the predetermined value α, the target lift amount Tvl is corrected, and when the deviation rate ΔGA is equal to or larger than the predetermined value β that is larger than the predetermined value α, an abnormality is notified. did. For this reason, when deposits are deposited, the treatment methods such as “correct the target lift amount Tvl” and “notify when the deposit deposit amount increases” are used when the deposit deposit amount is very small. One of the three treatment methods including the treatment method “The lift amount Tvl is not corrected” can be selected and dealt with. Accordingly, it is possible to select a treatment method in which the operation control of the lift amount changing mechanism 42 is executed without correcting the target lift amount Tvl when it is not necessary to correct the target lift amount Tvl because the deposit amount is very small. Therefore, it becomes possible to cope with deposit adhesion with a higher degree of freedom.

  (4) Since the correction according to the deviation rate ΔGA is stopped when the deviation rate ΔGA is equal to or greater than the predetermined value β, the maximum lift amount VL of the intake valve 30 is increased when the deposit amount increases. It becomes possible to execute the operation control of the lift amount changing mechanism 42 by selecting a control mode in which the upper limit is fixed.

The embodiment described above may be modified as follows.
-Instead of lighting the warning lamp 66, a warning buzzer may be heard. In addition, in a vehicle having a system having a screen for displaying information related to the vehicle, such as a navigation system, it is possible to display that the display screen has an abnormality. In short, it is only necessary to notify that when the deviation rate ΔGA is equal to or greater than the predetermined value β.

The process of determining whether or not the deviation rate ΔGA is greater than or equal to the predetermined value α (step S108 in FIG. 3) may be omitted.
A lower limit value is set for the maximum lift amount VL of the intake valve 30, and when the deviation rate ΔGA is greater than or equal to a predetermined value α (step S108: YES and step S110: NO), the lower limit value is large. You may make it employ | adopt the correction | amendment aspect of correct | amending this so that it may become. In such a configuration, only when the maximum lift amount VL of the intake valve 30 falls below the lower limit value, the maximum lift amount VL is changed so as to increase. Therefore, it is possible to avoid an excessive increase in the actual intake air amount GA due to deposit adhesion. As the correction mode, for example, a lower limit value may be variably set according to the deviation rate ΔGA, for example, a lower limit value may be calculated based on the deviation rate ΔGA. In this case, the lower limit value may be set so as to increase as the deviation rate ΔGA increases.

  The predetermined value γ is not limited to a value corresponding to the upper limit of the controllable range of the maximum lift amount VL, and can be arbitrarily changed. In short, any value can be set as the predetermined value γ as long as the reduction rate of the actual intake air amount GA can be kept low enough to maintain a stable engine operating state.

  The process of setting the predetermined value γ as the target lift amount Tvl (step S118 in FIG. 3) may be omitted. In place of the process, a process of calculating the correction amount K based on the deviation rate ΔGA (step S112), and a process of calculating the new target lift amount Tvl by adding the correction amount K to the target lift amount Tvl. It is also possible to execute (S114).

  For example, by omitting a condition such as “the internal combustion engine 10 is in an idle operation state” from the calculation conditions, the deviation rate ΔGA is calculated when the engine operation state is other than the idle operation state. Also good.

  Instead of calculating the deviation rate ΔGA (= (GAb−GA) / GAb), the ratio (= GA / GAb) or deviation (= GAb−GA) of the intake air amount GAb and the actual intake air amount GA is calculated. You may do it. In short, a value serving as an index of the degree of divergence between the intake air amount GAb and the actual intake air amount GA is obtained, and the target lift amount Tvl is corrected and the warning lamp 66 is turned on according to the same value. The effect is obtained.

  The estimation parameter used for the estimation of the intake air amount (calculation of the intake air amount GAb) in the reference state where no deposit is attached to the intake valve 30 can be arbitrarily changed. In short, it is only necessary to accurately estimate the intake air amount in the reference state. Specifically, in addition to the throttle opening degree TA, the maximum lift amount VL, the intake pressure PM, the engine rotational speed, the engine coolant temperature THW, etc. can be used for calculating the intake amount GAb, The intake air amount GAb can be calculated based on the plurality.

  A value (intake amount index value) that changes in correlation with the intake air amount, such as the intake air pressure, may be used for the correction process instead of the intake air amount. In the same configuration, the intake amount index value in the reference state is estimated based on the maximum lift amount VL of the intake valve 30, and the degree of divergence between the intake amount index value and the actual intake amount index value is corrected. It may be used.

  The present invention can also be applied to an internal combustion engine in which the actual intake amount is adjusted only by adjusting the maximum lift amount of the intake valve. Further, it can be applied to an internal combustion engine not provided with a throttle valve.

  The present invention is not limited to an internal combustion engine provided with a lift amount changing mechanism that changes the maximum lift amount of the intake valve corresponding to each cylinder in the same manner, but a lift that operates independently for each cylinder or each intake valve. The present invention can also be applied to an internal combustion engine provided with a quantity changing mechanism.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram which shows the schematic structure about one Embodiment which actualized the intake air amount control apparatus of the internal combustion engine concerning this invention. The graph which shows the change aspect of the maximum lift amount of an intake valve based on the action | operation of a lift amount change mechanism. The flowchart which shows the specific process sequence of a correction process.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Internal combustion engine, 12 ... Intake passage, 14 ... Throttle valve, 16 ... Throttle motor, 18 ... Combustion chamber, 20 ... Fuel injection valve, 24 ... Piston, 26 ... Crankshaft, 28 ... Exhaust passage, 30 ... Intake valve, 34 ... Intake camshaft, 42 ... Lift amount changing mechanism, 44 ... Actuator, 50 ... Electronic control unit, 52 ... Throttle sensor, 54 ... Intake amount sensor, 56 ... Intake pressure sensor, 58 ... Water temperature sensor, 60 ... Lift sensor, 62 ... Accelerator sensor, 64 ... Vehicle speed sensor, 66 ... Warning light.

Claims (6)

Applied to an internal combustion engine equipped with a lift amount change mechanism that changes the maximum lift amount of the intake valve, and corrects according to the degree of deviation between the intake amount index value estimated based on the maximum lift amount and the actual intake amount index value. In an intake air amount control device for an internal combustion engine that controls the actual intake air amount by executing the operation control of the lift amount changing mechanism according to the engine operating state while performing
An intake air amount control device for an internal combustion engine, comprising: a notifying means for notifying when the degree of divergence is equal to or greater than a predetermined value. The intake air amount control device for an internal combustion engine according to claim 1, wherein an opening degree of a throttle valve provided in an intake passage of the internal combustion engine is used as an estimation parameter for the intake air amount index value. The internal combustion engine according to claim 1 or 2, wherein the internal combustion engine includes a plurality of cylinders, and the lift amount changing mechanism changes the maximum lift amount of intake valves corresponding to the cylinders in the same manner. Intake amount control device. The divergence degree is obtained on the condition that the internal combustion engine is in an idle operation state, and operation control of the lift amount changing mechanism and notification by an informing means are executed according to the obtained divergence degree. An intake air amount control device for an internal combustion engine according to claim 1. When the divergence degree is equal to or greater than a first predetermined value, correction according to the divergence degree is performed, and when the divergence degree is equal to or greater than a second predetermined value that is greater than the first predetermined value. The intake air amount control device for an internal combustion engine according to any one of claims 1 to 4, which is notified by the notification means. The intake air amount control device for an internal combustion engine according to any one of claims 1 to 5, wherein when the notification by the notification means is executed, the correction according to the degree of deviation is stopped.

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